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Registros recuperados: 6
Primeira ... 1 ... Última
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Experimental and natural cathodoluminescence in the shell of Crassostrea gigas from Thau lagoon (France): ecological and environmental implications ArchiMer
Langlet, D; Alunno-bruscia, Marianne; Rafelis, M; Renard, M; Roux, M; Schein, E; Buestel, Dominique.
We present a cathodoluminescence (CL) study of growth layer deposition in the shell of the oyster Crassostrea gigas. CL is based on the physical properties of lattice-bound manganese (Mn2+), which is the main activator in calcium carbonate. Our study involved chemical marking by immersing individuals in seawater to which manganese chloride had been added, and subsequent reading of the shell with CL microscopy coupled with numeric treatment of microphotographs; CL emission was analyzed using a scanning electron microscope coupled to a spectrometer. Since the marking did not harm the oysters, repeated markings were possible, allowing validation of the inferences made from analysis of the shell rings. Oysters reared in a French Mediterranean lagoon (Thau...
Tipo: Text Palavras-chave: Mediterranean lagoon; Manganese marking; Carbonate biomineraliation; Shell growth; Cathodoluminescence; Oyster.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1979.pdf
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Impact of contaminated sediment elutriate on coastal phytoplankton community (Thau lagoon, Mediterranean Sea, France) ArchiMer
Ben Othman, Hiba; Pringault, Olivier; Louati, Hela; Hlaili, Asma Sakka; Leboulanger, Christophe.
Effects of sediment-released contaminants and nitrogen were assessed on phytoplankton communities sampled from Thau lagoon (France, Mediterranean Sea) and one close offshore marine station. Phytoplankton was exposed to sediment elutriate (seawater containing a mix of metals, organic chemicals, and nutrients) or to ammonium enrichment for four days using immersed microcosms exposed to natural conditions of light and temperature. Functional (production - respiration balance) and structural (taxonomy and cell densities) responses of the phytoplankton community were assessed. In the lagoon, both treatments stimulated phytoplankton growth, compare to controls. Conversely in the offshore station, the phytoplankton growth was stimulated only with the sediment...
Tipo: Text Palavras-chave: Sediment resuspension; Mediterranean lagoon; Contaminants; Nutrients; Phytoplankton community.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00352/46364/46317.pdf
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Organisation spatiale et modélisation écologique d'un peuplement phytoplanctonique de lagune (étang de Thau, France) ArchiMer
Jarry, V; Frisoni, Gf; Legendre, P.
A systematic sampling of twenty stations was conducted over four periods within a year (June 1986, October 1986, February 1987, and May 1987) in Thau lagoon. Multivariate analyses (clustering, and principal coordinate analysis) were carried out on phytoplankton species counts. These analyses allowed homogenous areas within the lagoon to be identified and permitted the characterization of these areas in terms of the marine or continental origins of their phytoplankton taxa. The results show the relative importance of each kind of input (marine, continental), and contrast the punctual influence of the continental inputs against the more global effects of the sea. The conclusions drawn from the taxonomic portion of the study were confirmed by statistical...
Tipo: Text Palavras-chave: Phytoplankton; Populations; Chlorophyll pigments; Ecological modelling; Mediterranean lagoon; PHYTOPLANKTON; POPULATIONS; CHLOROPHYLL PIGMENTS; ECOLOGICAL MODELING; MEDITERRANEAN LAGOON.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00323/43397/43105.pdf
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Silver eel population size and escapement in a Mediterranean lagoon: Bages-Sigean, France ArchiMer
Amilhat, Elsa; Farrugio, Henri; Lecomte-finiger, R.; Simon, Guillaume; Sasal, P..
Much concern has been raised about the decline in the European eel (Anguilla anguilla) population. European management plans for the recovery of the stock are now in preparation, the main objective being to increase the escapement of the potential spawners (silver eels) in each basin to allow 40% of the pristine biomass to escape. However, there are relatively few studies on silver eel escapement and production, and no recent measurement of escapement in lagoons, habitats which support large silver eel sub-populations in the Mediterranean region. A mark-recapture study was carried out in autumn 2007 in order to estimate the number of silver eels migrating from the Bages-Sigean lagoon in the South-West of France. The migrating population, mostly males...
Tipo: Text Palavras-chave: Escapement; Mark recapture; Mediterranean lagoon; Silver eel; Anguilla anguilla; Échappement; Marquage recapture; Lagune méditerranéenne; Anguille argentée; Anguilla anguilla.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-6611.pdf
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Temporal and spatial changes of seagrass meadows in a Mediterranean coastal lagoon ArchiMer
Agostini, S; Marchand, B; Pergent, G.
Aerial photographs and in situ data of the Urbinu Lagoon (one of the largest and deepest ponds in Corsica, Mediterranean Sea) permit the establishment of a cartography of its aquatic benthic assemblages and types of sea-beds. It was possible to distinguish in the photographs submerged structures such as: sand, pebbles, mud and seagrass meadows. Seagrass beds were the predominant vegetation type in this lagoon (comprising 14-29% of the total area depending on the year studied), and their distribution was incorporated into a geographical information database, and then compared with historical data. Temporal and spatial change in seagrass meadows was assessed between 1990 and 1997. Change in total extent was evaluated through a map to map comparison of data...
Tipo: Text Palavras-chave: Phanérogames; Lagune méditerranéenne; Traitement d’image; Évolution d’écosystème; Seagrasses; Mediterranean lagoon; Image processing; Change detection.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00322/43296/43032.pdf
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The planktonic food web of the Bizerte lagoon (south-western Mediterranean) during summer: I. Spatial distribution under different anthropogenic pressures ArchiMer
Hlaili, A; Grami, B; Niquil, N; Gosselin, M; Hamel, D; Troussellier, Marc; Mabrouk, H.
The structure and the trophic interactions of the planktonic food web were investigated during summer 2004 in a coastal lagoon of southwestern Mediterranean Sea. Biomasses of planktonic components as well as bacterial and phytoplankton production and grazing by microzooplankton were quantified at four stations (MA, MB, MJ and R) inside the lagoon. Station MA was impacted by urban discharge, station MB was influenced by industrial activity, station MJ was located in a shellfish farming sector, while station R represented the lagoon central area. Biomasses and production rates of bacteria (7-33 mg C m(-3); 17.5-35 mg C m(-3) d(-1)) and phytoplankton (80-299 mg C m(-3); 34-210 mg C m(-3) d(-1)) showed high values at station MJ, where substantial...
Tipo: Text Palavras-chave: Anthropogenic pressure; Spatial distribution; Planktonic food web; Mediterranean lagoon.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4116.pdf
Registros recuperados: 6
Primeira ... 1 ... Última
 

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